The Internet has merged itself as an extremely ground- breaking stage that has changed the correspondence and business exchanges. Presently, the quantity of clients exploring the Internet is more than 2.4 billion. This enormous group of spectators requests online business, learning sharing, informal organizations and so on, which became exponentially in the course of recent years. Accordingly, it prompts the requirement for security and improved protection. As of late, misrepresentation over the Internet comprises one of the fundamental disadvantages for the across the board of the utilization of business applications. Along these lines, the three imperative security issues occur each day in our universe of straightforward design, even more decisively: recognizable proof, confirmation and approval. Distinguishing proof is a procedure that empowers acknowledgment of a substance, which might be either, a human, a machine, or another advantage, for example, a product program. In security frameworks, validation and approval are two reciprocal systems for figuring out who can get to the data assets over a system. Numerous arrangements have been proposed in the writing, from a straightforward secret phrase to late advancements dependent on RFID (Radio Frequency Identification) or biometrics. This paper gives an outline on existing verification techniques, and its upsides and downsides when planning online assistance.